I switched a while ago from SharpCap to NINA but realized some funky dark blotchy areas in some of my images. Trying to ascertain what the issue was, I kept checking everything I could think of: camera issues, overall setup (I am in a permanent observatory), my flats, dark flats, and the lights themselves. After sharing some of my subs with a friend (Uwe Deutermann) and chatting with the moderators at APP (since I use APP to calibrate and integrate the subs), the problem was discovered. My dark library was made with SharpCap prior to using NINA. Apparently, that created the issue. So, just as a FYI, if you experience anything like what I did, make sure your darks, and your flats and dark flats for that matter, are done using the same program.
Darks: Don't make this mistake
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Hi Bruce,
I‘d make a bet that the reason is found in the offset setting of the camera‘s driver. If you have different offset settings, especially set the offset too low, you‘ll clip data. Or if offset of darks/bias and lights mismatch.
Take a look at the file headers. They might state the offset setting when the frame was captured.
CS,
Björn
I‘d make a bet that the reason is found in the offset setting of the camera‘s driver. If you have different offset settings, especially set the offset too low, you‘ll clip data. Or if offset of darks/bias and lights mismatch.
Take a look at the file headers. They might state the offset setting when the frame was captured.
CS,
Björn
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Björn Arnold:
Hi Bruce,
I‘d make a bet that the reason is found in the offset setting of the camera‘s driver. If you have different offset settings, especially set the offset too low, you‘ll clip data. Or if offset of darks/bias and lights mismatch.
Take a look at the file headers. They might state the offset setting when the frame was captured.
CS,
Björn
I agree. I ran into this issue when I switched to NINA from SGP. The dark library I shot with SGP had a different offset setting.
CS,
Loran
Hi all,
This has also happened to me. That's why I recommend that you always set the offset yourself (as well as you do with gain).
CS
Mike
This has also happened to me. That's why I recommend that you always set the offset yourself (as well as you do with gain).
CS
Mike
Hello, this is a classical mistake I also did some years ago. I used to take my photos on my AtikOne with the Artemis software from Atik. Then two years ago I switched to Sequence Generator Pro (SGP) for the lights but I still took the offsets, darks and flats with Artemis. Suddenly I realized that the dust donuts of the flats were not corrected at all, the flats made it even worse ! By looking carefully I realized that there was a horizontal miror in the image ! Actually these fit files are not read or generated in the same way. As a consequence I had to generate horizontal mirors of my flats, darks and offsets in order to preprocess my lights in the right way. Now I take all pictures with SGP. A very silly thing, fortunately the bad flat correction was so obvious that I could realize the issue quite quickly, because even in the offsets and darks the correction was bad. So be careful !
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Bruce Donzanti:
I switched a while ago from SharpCap to NINA but realized some funky dark blotchy areas in some of my images. Trying to ascertain what the issue was, I kept checking everything I could think of: camera issues, overall setup (I am in a permanent observatory), my flats, dark flats, and the lights themselves. After sharing some of my subs with a friend (Uwe Deutermann) and chatting with the moderators at APP (since I use APP to calibrate and integrate the subs), the problem was discovered. My dark library was made with SharpCap prior to using NINA. Apparently, that created the issue. So, just as a FYI, if you experience anything like what I did, make sure your darks, and your flats and dark flats for that matter, are done using the same program.
Thanks Bruce..
So you recommended : Take darks ,flats and dark flats with the same program..
I am using NINA to do that and using APP for integration.. is that wrong you mean..
Correct me please if I am wrong.
BR,,
Ali
Hi Ali
You are fine using NINA and APP as you described. It is exactly what I do and it works just fine.
Bruce
You are fine using NINA and APP as you described. It is exactly what I do and it works just fine.
Bruce